Gas-engine.



PATENTED MAR. 24, 1908.

G. O. GARLSON.

GAS ENGINE.

APPLICATION FILED APR. 12, 1901.

I 2 SHEETS-SHEET 1.

FIG. 4

FIG. 1

- I I I I Wj/j I A V f Y V V I f f I f mvzu'ron.

WITNESSES.

CHARLES O. OARLS ON, OF PORT RICHMOND, NEW YORK.

GAS-ENGINE.

Specification of Letters Patent.

Patented March 24, 1908.

Application filed April 12, 1907. Serial No. 367,863.

To all whom it may concern:

Be it known that I, CHARLES O. CARLSON, a resident of Port Richmond,Staten Island, in the county of Richmond and State of New York, haveinvented a new and useful Improvement in Gas-Engines and I do hereby decare the following to be a full, clear, and exact description thereof.

My invention relates to gas engines, its object being to provide a noveland simple form of mechanism by means of which the air may be forcedinto the cylinder after the explosion in order to scavenge the same andpre are the cylinder for the next charge.

0 these ends nay-invention comprises the novel features hereinafter setforth and claimed.

In the accompanyin drawings Figure 1 is a vertical sectional e evationof my improved gas engine; Fig. 2 is a like view showmg the piston incompression; F' 3 is a like view showing the piston and va ve mechanismin position where the iston is about to ascend to compress the c arge;Fig. 4 is an enlarged detail view of a portion of the cylinder and valvemechanism; Fig. 5 is detail view'of the cam for operating the exhaustvalve; Fig. 6 is a section on the line 66, Fig. 4. 1

In the drawings the numeral 2 designates a suitable cylinder providedwith a suitable water jacket 3, said cylinder being illustrated inupright form and sup orted by the section 4 orming the guide or thecross head 5. This section 4 1s bolted or secured to the closed crankcase 6. Within the cylinder 2 is the cup-piston 7 to which the pistonrod 8 is secured, said piston rod passing down through a suitablestuffing box 9 in the diaphragm 10 which se arates the lower chamber 11of the cylin er from the cross head casing 4. The cross head 5is-secured to the piston 8 and a pitman 12 connects said cross head tothe crank 13 on the engine shaft 14. At the u per end of the cylinder 2is the valve 15 w 10h controls the supply of explosive mixture enteringthe ort 16.

The cylinder 2 is rovided wit1 the exhaust port 17contro led. by thevalve 18. This valve 18 has the stem 19 which passes down through theguides 20 and to the lower end' of said rod is secured the yoke 21 whichfits over the shaft 22. On said yoke is the friction roller or in 23 inthe path of the cam 24 secured to tie shaft 22. This shaft 22 I has onit a bevel gear 25 meshing with the transmitted from the engine shaft tothe shaft 22 to operate the cam which raises the exhaust valve 18 asfully hereinafter set forth.

Within the valve casing 33 on the cylinder 2 is the valve 34 controllingthe port 35 leading to the upper chamber of the cylinder at a point justabove the lowest position of the piston, and the port 36 whichcommunicates with the passa e 37 leading to the chamber 11 of the cyliner below the piston. A main air inlet 38 is connected up to the valvecasing 33 and communicates with the annular passage 39 which is adaptedto be brought into communication with the ort 36lead1ng gntohthe assage37 as fully ereinafter set ort the atmosphere. Connected to the valve 34his air-inlet 38 communicates with is a stem or rod 40, the lower end ofsaid rod having the yoke 41 secured thereto engaging the shaft 22. Afriction'roller or in 42 is carried by the yoke 41'and said pin tswithin the cam-way 43 of the dam disk 44 secured to the shaft 22.

When my improved as engine is in 0 eration, the charge of exp osivemixture is t drawn through the valve 15 which is lowered by the descentof the piston 7 the exhaust valve being closed and the valve 34 bein inposition to close the ports 35 and 36. The explosive mixture being drawnin by the descent of the piston, the piston then ascends to compress thecharge which is thereupon ignited in .the ordinary way to create theexplosion. The piston in; the meantime, upon 1ts upward stroke tocompress the explosive mixture has drawn in the air through the inlet38, the valve 34 having been moved by the cam 44 so as to bring theannular passa e into register with the port 36, whereby t e air passesinto the passage 37, being drawn into the chamber 11 of the cylinder bythe suction of the piston as said piston ascends to compress the charge.Upon the descent of the piston after the explosion, the valve 34 ismoved to the position indicated in Fig. 2 so as to close the ports 35and 36. As sald piston descends, the air admitted to the chamber 11below the piston is gradually compressed and just before said pistonopens the forced up through the passage 37, the port 36,

, inder.

the exhaust valve 18, permitting the foul the time said iston 7 hasassed the port 35 1 the cam 44 wi l have move the cyhnder 2 at thispoint under compresport 35 the action of the cam operates to lift gasesto escape through said valve and by the valve 34 into the positionindicated in 1, whereupon the-air compressed within the chamber 11 isthrough the valve 34 and passage 35 into the cylinder 2 just above thepiston 7 when in its 1 lowest position. This air being admitted to sionacts to drive out the foul gases, the valve 18 remaining open asuflicient length of time i to emit of this. In this manner the airenterlng the cylinder above the iston acts to scavenge the cylinder andc ean it thoroughly so as to pre are it for the admission of anothercharge 0 the explosive mixture. The operation of the cams 24 and 44 aretimed so that just as the piston is about to descend to draw in the newcharge of the explosive the valve 18 is closedand the valve 34 isbrought to the position indicated in Fig. 2. In this manner, as thepiston ascends, the valves 18 and 34 are so operated as to open andclose the exhaust and draw the fresh air into the cylinder below thepiston and force said air into the space above" the piston so as tothoroughly scavenge the cyl- The valve mechanism may be timed with greataccuracy so as to 0 erate at the pro er periods to give the resu tsabove descri ed.

What I claim is:

1. In a gas engine, the combination of a cylinder, a piston therein, apiston rod, connections between said rod and the engine shaft, a gasinlet port at the upper end of said cylinder, an exhaust valve, a mainair port, an air ort leading to the upper portion of said cy inder at apoint just above the lowest position of said piston, a secondair p'ortleadmg to the lower end of said cylinder, a valve controlling said portsand means for operating said valve, whereby air is drawn into the lowerend of said cylinder by the ascent of said piston, compressed therein,and admitted to the upper end of said cylinder when said piston in itsdescent passes the air port leading thereto.

2. In a gas engine, the combination of a cylinder, a piston therein, aiston rod, connections between said rod an engine shaft, a gas inletport at the upper end of said cylinder, an exhaust valve, a main airport, an air port leading to the upper portion of said cylinder at apoint just above the lowest position of said piston, a second air portleading to the lower end of said cylinder, a valve controlling saidports, cam mechanism for operating said valve, connections between saidcam mechanism and the engine shaft, whereby air is drawn into the lowerend of said cylinder by the ascent of said piston, compressed thereinand admitted to the upper end of said cylinder when said piston in itsdescent passes the air port leading thereto.

3. In a gas engine, the combination of a cylinder, a piston therein, apiston rod, connections between said rod and the engine shaft, a gasinlet port at the upper end of said cylinder, an exhaust valve, a mainair port communicating directly with the atmosphere, an air ort leadingto the upper portion of said cy inder at a point just above the lowestposition of said piston, a second air port leading to the lower end ofsaid cylinder, a valve controlling said port and means for operatingsaid valve whereby air is drawn into the lower end of said cylinder bythe ascent of said piston, compressed therein, and admitted to the upperend of said cylinder when said piston in 1ts descent passes the air portleading thereto.

In testimony whereof, I the said CHARLES O. CARLsoN have hereunto set myhand.

CHARLES O. CARLSON.

Witnesses:

RUDOLPH STRANDBERG, CLARENCE D. HART.

